The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 04, 2012
Filed:
Apr. 22, 2009
Olaf Winterhalter, Epfendorf, DE;
Andreas Kull, Donaueschingen, DE;
Olaf Winterhalter, Epfendorf, DE;
Andreas Kull, Donaueschingen, DE;
Minebea Co., Ltd., Nagano-Ken, JP;
Abstract
A fluid dynamic bearing having at least one first bearing part as well as a second bearing part that are rotatably supported with respect to one another about a rotational axis and separated from one another by a bearing gap filled with bearing fluid. Associated bearing surfaces of the bearing parts form a first and a second radial bearing that are marked by grooved bearing patterns disposed on at least one bearing surface. Between the radial bearings, there is a separator gap having an enlarged gap distance compared to the bearing gap. The ends of the grooved bearing patterns of the radial bearings adjoining the separator gap penetrate into the separator gap. This measure prevents the creation of negative pressure at the ends of the grooved bearing patterns, as a result of which the formation of air bubbles is also reduced.